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IIS Log 401/200 on Mapi and EWS

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Hi,

I'm running Exchange 2013 SP1, using KEMP as load balancers in front - SSL Offloading is enabled. After some of my users have started to use MAPI over HTTP, our IIS logs has started to grow rapidly.

I see alot of there lines in the log:

2014-04-28 09:55:22 172.16.25.204 POST /mapi/emsmdb/ ;&cafeReqId=73899dcb-cb47-4820-8d19-a84719a53127">MailboxId=06523f9d-604a-48e1-8f75-a450fa80dccd@kromannreumert.com&CorrelationID=<empty>;&cafeReqId=73899dcb-cb47-4820-8d19-a84719a53127; 80 - 172.16.25.91 Microsoft+Office/15.0+(Windows+NT+6.2;+Microsoft+Outlook+15.0.4551;+Pro) - 401 1 2148074254 15
2014-04-28 09:55:22 172.16.25.204 POST /mapi/emsmdb/ ;&cafeReqId=b02eadc9-c875-4ec8-9c7a-7df2c5bc565a">MailboxId=06523f9d-604a-48e1-8f75-a450fa80dccd@kromannreumert.com&CorrelationID=<empty>;&cafeReqId=b02eadc9-c875-4ec8-9c7a-7df2c5bc565a; 80 - 172.16.25.91 Microsoft+Office/15.0+(Windows+NT+6.2;+Microsoft+Outlook+15.0.4551;+Pro) - 401 1 2148074254 15
2014-04-28 09:55:22 172.16.25.204 POST /mapi/emsmdb/ ;&cafeReqId=b64fbfbd-9e77-4356-a272-c6f5250863eb">MailboxId=06523f9d-604a-48e1-8f75-a450fa80dccd@kromannreumert.com&CorrelationID=<empty>;&cafeReqId=b64fbfbd-9e77-4356-a272-c6f5250863eb; 80 - 172.16.25.91 Microsoft+Office/15.0+(Windows+NT+6.2;+Microsoft+Outlook+15.0.4551;+Pro) - 401 1 2148074254 15
2014-04-28 09:55:22 172.16.25.204 POST /mapi/emsmdb/ ;&cafeReqId=96617663-dd0d-4c10-8f53-24e9a1284503">MailboxId=06523f9d-604a-48e1-8f75-a450fa80dccd@kromannreumert.com&CorrelationID=<empty>;&cafeReqId=96617663-dd0d-4c10-8f53-24e9a1284503; 80 - 172.16.25.91 Microsoft+Office/15.0+(Windows+NT+6.2;+Microsoft+Outlook+15.0.4551;+Pro) - 401 1 2148074254 0

I understand, that it first try to auth. without username, and then Again using username, but howcome it does this Again and Again?

I don't see this, on users running RPC over HTTP?

Regards

Allan


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